单项选择题

The thirty-day forecast is determined by examining ______.

A．upper air levels
B．satellite reports
C．changing fronts
D．daily air maps
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单项选择题
It can be inferred from the passage that the economic foundation of society is dependent on ______.
A．the ability to make money
B．the will to work for pleasure
C．the capacity to enjoy incentives
D．the categorizations of our emotional experiences
单项选择题
At the present time, experiments are being conducted in ______.
A．30-day "outlook"
B．controlling storms
C．satellites
D．manipulating weather
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